Although it is said that "age is not a problem, and height is not a distance," in reality, it is very necessary for a man and a woman to be together except for some external conditions, such as education, knowledge, temperament, etc. Otherwise, the final outcome of two people who love each other will be inseparable from quarrels or breakups. This is why fairy tales always end with the sentence "The prince and the princess lived happily ever after." A Peng and A Li are such a pair who exist in differences.